After Xerxes was killed, his son Artaxerxes I Makrocheir from his wife Amestris ascends the throne. During his Xerxes' reign, the expansion of the empire came to an end. Gandara and Taxila in the far east were lost. Still, the Persian empire remained the strongest power on earth with strong cultural influence. The Greeks copied institutions from Persia. Artaxerxes repressed the insurrection in Egypt after his brother Achaemenes was killed by the rebels supported by Athens just before 449/448 when he made a peace treaty in which Persia and Athens agreed on the limits of their domains of influence. After the outbreak of the Peloponnesian War in 431; both Athens and Sparta asked for Persian support Persians somehow supported both sides. Artaxerxes died between 24 December 424 and 10 January 423 B.C. and was buried in Naghsh Rostam. The last cuneiform tablet from the reign of Artaxerxes I which was found in Nippur was dated 24 December 424.